<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

      <div class='out'>
          <div class='left_div'>
               <div class='left_content'></div>
               <div>
                <div class='input_div'>
                    <input type="text" id='left_msg' style='margin-top: 15px;margin-bottom: 15px;'>
                    <br>
                    <button>发送(增加)</button>
                    <button>撤回(删除)</button>
                    <button>修改(替换)</button>
                 </div>
               </div>
          </div>
           <div class='right_div'>
            <div class='right_content'></div>
            <div>
             <div class='input_div'>
                 <input type="text" id='right_msg' style='margin-top: 15px;margin-bottom: 15px;'>
                 <br>
                 <button>发送(增加)</button>
                 <button>撤回(删除)</button>
                 <button>修改(替换)</button>
              </div>
            </div>
           </div>
      </div>
    
</body>
</html>